Optical lens including five lenses of −−+−+, −−+++ or −−+−+, or six lenses of −−−+−+ or −−++−+ refractive powers
US11841483B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Nov 15, 2019 |
| Grant date | Dec 12, 2023 |
| Priority date | — |
| Expiry date | Apr 11, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/06
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical lens includes a first lens group, a second lens group and an aperture stop. The first lens group includes three lenses with refractive powers. The second lens group has a positive refractive power and includes two lenses with refractive power. The aperture stop is disposed between the first lens group and the second lens group. The optical lens satisfies the conditions of 2 mm<DL<6 mm, LT<15 mm and 0.2<DL/LT<0.38, where DL is a diameter of a lens surface of the second lens group furthest from the first lens group, and LT is a length measured on the optical axis between two outermost lens surfaces of the optical lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.